I agree if we could just distill "here's your objective good-at-tennis score" for everybody and draw lines using those numbers, that makes sense. It feels unrealistic? I.e. we already don't do that - it doesn't necessarily feel like 100% an anti-trans thing (orthogonal obviously to the large amount of anti-trans sentiment that generally exists). Maybe Elo for everything?
My point is just that fairness in the Olympics is fake and always has been.
Someones Chromosomes are such a poor way to measure their physical abilities especially when the bar is so high for top athletes in the field.